PPIx::Regexp::Util(3)

NAME
PPIx::Regexp::Util - Utility functions for PPIx::Regexp;

SYNOPSIS
 use PPIx::Regexp::Util qw{ __instance };
     .
     .
     .
 __instance( $foo, 'Bar' )
     or die '$foo is not a Bar';

DESCRIPTION
This module contains utility functions for PPIx::Regexp which it is convenient to centralize.

Double-underscore subroutines are private to the "PPIx-Regexp" package. Their documentation is provided for the author's convenience only, and they are subject to change without notice. Caveat user.

This module exports nothing by default.

SUBROUTINES
This module can export the following subroutines:

  is_ppi_regexp_element
 is_ppi_regexp_element( $elem )
   and print "$elem is a regexp of some sort\n";

This subroutine is public and supported.

This subroutine takes as its argument a PPI::Element. It returns a true value if the argument represents a regular expression of some sort, and a false value otherwise.

  __instance
 __instance( $foo, 'Bar' )
     and print '$foo isa Bar', "\n";

This subroutine is private to the "PPIx-Regexp" package.

This subroutine returns true if its first argument is an instance of the class specified by its second argument. Unlike "UNIVERSAL::isa", the result is always false unless the first argument is a reference.

  __is_ppi_regexp_element
 __is_ppi_regexp_element( $elem )
   and print "$elem is a regexp of some sort\n";

This subroutine is private to the "PPIx-Regexp" package.

This is a synonym for is_ppi_regexp_element(), and is deprecated in favor of it. If called, it will complain via Carp::cluck() and then "goto &is_ppi_regexp_element".

  __merge_perl_requirements
This subroutine is private to the "PPIx-Regexp" package.

This subroutine merges perl requirements as returned by the various "__perl_requirements()" methods.

  __ns_can
This subroutine is private to the "PPIx-Regexp" package.

This method is analogous to can(), but returns a reference to the code only if it is actually implemented by the invoking name space.

  __post_rebless_error
This method is private to the "PPIx-Regexp" package. The intended use is to alias it to "__PPIX_ELEM__post_reblessing()".

It takes arguments as name/value pairs. Argument "{error}" is the error message; if it is omitted you get a warning with stack trace. Argument "{explanation}" defaults to "{error}".

It returns the number of errors to add to the parse.

  raw_width
This public method returns the minimum and maximum width matched by the element before taking into account such details as what the element actually is and how it is quantified.

This implementation is appropriate to things that match exactly one character -- i.e. it returns "( 1, 1 )".

  __to_ordinal_en
This subroutine is private to the "PPIx-Regexp" package.

This subroutine takes as its argument an integer and returns a string representing its ordinal in English. For example

 say __to_ordinal_en( 17 );
 # 17th

  width
 my ( $min_wid, $max_wid ) = $self->width();

This public method (well, mixin) returns the minimum and maximum width of the text matched by the element.

Elements which import this method must also implement a raw_width() method which returns the unquantified width of the element.

EXPORT TAGS
The following export tags are defined by this module. All are private to the "PPIx-Regexp" package unless otherwise documented.

  all
This tag exports everything exportable by this module.

  width_one
This tag is appropriate to an element which, when unquantified, matches exactly one character. It exports raw_width() and width().

SEE ALSO
Params::Util, which I recommend, but in the case of "PPIx::Regexp" I did not want to introduce a dependency on an XS module when all I really wanted was the function of that module's _INSTANCE() subroutine.

SUPPORT
Support is by the author. Please file bug reports at <https://rt.cpan.org/Public/Dist/Display.html?Name=PPIx-Regexp>, <https://github.com/trwyant/perl-PPIx-Regexp/issues>, or in electronic mail to the author.

AUTHOR
Thomas R. Wyant, III wyant at cpan dot org

COPYRIGHT AND LICENSE
Copyright (C) 2010-2023, 2025 by Thomas R. Wyant, III

This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full text of the licenses in the directory LICENSES.

This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.